Module structure changed.

This library must to be compatible with Django and Pypip, so I had to change the
directory hierarchy. The Sphinx documentation was updated.
Introduction in README.md.

I added some bullshit in the README.md. Is hard to explain my thoughts about
it.
VideoLibrary class updated.

More methods added and a some fix regarding returns formats.
I'm wondering what's the best feature to add first. Suggestions?